From nobody Sun Feb 8 23:25:55 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2AED2C76196 for ; Fri, 7 Apr 2023 01:16:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238887AbjDGBQe (ORCPT ); Thu, 6 Apr 2023 21:16:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238212AbjDGBQb (ORCPT ); Thu, 6 Apr 2023 21:16:31 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98F295B9A for ; Thu, 6 Apr 2023 18:15:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680830140; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yTjaXVllxkU/aHGZ94OX1yUAx1aLhOMTauMuyCLZAvA=; b=YvdvoYTFgUBCFyxnoVb/x+3RwbMrL04AX51LJSeiBdVtb9jNbCdv5Db3rB0gqHKl8A4Srh SWgB/grlZI8Emk6icUECsffxSs04rfXZ1DBvwfJq4kovhvFMi9NDaboChFF8F0uNLYxIRL 4eDF1ODL49gfs2KMsSYMmFItjpV6FlY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-441-aB3Vm8o1PqWzLKh0TWuknA-1; Thu, 06 Apr 2023 21:15:37 -0400 X-MC-Unique: aB3Vm8o1PqWzLKh0TWuknA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A994E185A78B; Fri, 7 Apr 2023 01:15:36 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-86.pek2.redhat.com [10.72.12.86]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4190818EC6; Fri, 7 Apr 2023 01:15:30 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: catalin.marinas@arm.com, rppt@kernel.org, thunder.leizhen@huawei.com, will@kernel.org, ardb@kernel.org, horms@kernel.org, John.p.donnelly@oracle.com, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Baoquan He Subject: [PATCH v2 3/3] arm64: kdump: defer the crashkernel reservation for platforms with no DMA memory zones Date: Fri, 7 Apr 2023 09:15:07 +0800 Message-Id: <20230407011507.17572-4-bhe@redhat.com> In-Reply-To: <20230407011507.17572-1-bhe@redhat.com> References: <20230407011507.17572-1-bhe@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In commit 031495635b46 ("arm64: Do not defer reserve_crashkernel() for platforms with no DMA memory zones"), reserve_crashkernel() is called much earlier in arm64_memblock_init() to avoid causing base apge mapping on platforms with no DMA meomry zones. With taking off protection on crashkernel memory region, no need to call reserve_crashkernel() specially in advance. The deferred invocation of reserve_crashkernel() in bootmem_init() can cover all cases. So revert the whole commit now. Signed-off-by: Baoquan He Reviewed-by: Zhen Lei --- arch/arm64/include/asm/memory.h | 5 ----- arch/arm64/mm/init.c | 34 +++------------------------------ 2 files changed, 3 insertions(+), 36 deletions(-) diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memor= y.h index 78e5163836a0..efcd68154a3a 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -374,11 +374,6 @@ static inline void *phys_to_virt(phys_addr_t x) }) =20 void dump_mem_limit(void); - -static inline bool defer_reserve_crashkernel(void) -{ - return IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32); -} #endif /* !ASSEMBLY */ =20 /* diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 58a0bb2c17f1..66e70ca47680 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -61,34 +61,8 @@ EXPORT_SYMBOL(memstart_addr); * unless restricted on specific platforms (e.g. 30-bit on Raspberry Pi 4). * In such case, ZONE_DMA32 covers the rest of the 32-bit addressable memo= ry, * otherwise it is empty. - * - * Memory reservation for crash kernel either done early or deferred - * depending on DMA memory zones configs (ZONE_DMA) -- - * - * In absence of ZONE_DMA configs arm64_dma_phys_limit initialized - * here instead of max_zone_phys(). This lets early reservation of - * crash kernel memory which has a dependency on arm64_dma_phys_limit. - * Reserving memory early for crash kernel allows linear creation of block - * mappings (greater than page-granularity) for all the memory bank rangs. - * In this scheme a comparatively quicker boot is observed. - * - * If ZONE_DMA configs are defined, crash kernel memory reservation - * is delayed until DMA zone memory range size initialization performed in - * zone_sizes_init(). The defer is necessary to steer clear of DMA zone - * memory range to avoid overlap allocation. So crash kernel memory bound= aries - * are not known when mapping all bank memory ranges, which otherwise means - * not possible to exclude crash kernel range from creating block mappings - * so page-granularity mappings are created for the entire memory range. - * Hence a slightly slower boot is observed. - * - * Note: Page-granularity mappings are necessary for crash kernel memory - * range for shrinking its size via /sys/kernel/kexec_crash_size interface. */ -#if IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32) phys_addr_t __ro_after_init arm64_dma_phys_limit; -#else -phys_addr_t __ro_after_init arm64_dma_phys_limit =3D PHYS_MASK + 1; -#endif =20 /* Current arm64 boot protocol requires 2MB alignment */ #define CRASH_ALIGN SZ_2M @@ -248,6 +222,8 @@ static void __init zone_sizes_init(void) if (!arm64_dma_phys_limit) arm64_dma_phys_limit =3D dma32_phys_limit; #endif + if (!arm64_dma_phys_limit) + arm64_dma_phys_limit =3D PHYS_MASK + 1; max_zone_pfns[ZONE_NORMAL] =3D max_pfn; =20 free_area_init(max_zone_pfns); @@ -408,9 +384,6 @@ void __init arm64_memblock_init(void) =20 early_init_fdt_scan_reserved_mem(); =20 - if (!defer_reserve_crashkernel()) - reserve_crashkernel(); - high_memory =3D __va(memblock_end_of_DRAM() - 1) + 1; } =20 @@ -457,8 +430,7 @@ void __init bootmem_init(void) * request_standard_resources() depends on crashkernel's memory being * reserved, so do it here. */ - if (defer_reserve_crashkernel()) - reserve_crashkernel(); + reserve_crashkernel(); =20 memblock_dump_all(); } --=20 2.34.1